[Asterisk-Users] Strange intermittent NAT problem with BT100s

[Alex Vishnev]

I have seen the same problem as well. If don't think this is a problem with
BT100. I think the problem is with public STUN server. I think sometimes,
the server is too overloaded and can't provide the translation. That is when
you are getting the problem with your clients behind NAT. the only solution
is to build your own stun server and use it, instead of using public
servers.

Alex

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Tomas Florian
Sent: Thursday, April 14, 2005 2:32 AM
To: asterisk-users at lists.digium.com
Subject: [Asterisk-Users] Strange intermittent NAT problem with BT100s


Hello, 

I have a strange problem whenever I have 2 or more BT100s behind NAT.  I am
not able to reproduce this error reliably, but it happens every 2-5 minutes.


The general setup is that there is Asterisk server sitting at a central
location.  Some peers connect directly (206,205,201) but some (204,203,200)
connect through NAT.

This all works fine ...but it is extremely unreliable ... I get UNREACHABLE
and then OK again ... UNREACHABLE and OK again .. unpredictably.  When it's
OK I can make phone calls no problem.... of course when it goes UNREACHABLE
there is trouble.

I tried to replace one of the BT100 phones with X-Lite and that one is OK
(~40ms) rock solid - or seems to be so far.  So it seems that there is
something weird going on with BT100

My configuration of BT100 is as follows:
- firmware 1.0.5.23 (I've noticed similar problems with .16 also)
- detected NAT type is symmetric NAT
- STUN stun.xten.net (I'm using Xtens ... or do I have to use my own???)
- no outbound proxy
- register expiration = 1
- keep alive interval = 20 sec (I also tried as low as 1 sec)

My sip configuration uses:
- nat = yes
- qualify = yes (I also tried longer qualify 10000 with no luck)

This is what I get with sip show peers ... the 204 and 200 are BT100 and
sometimes one or both go UNREACHABLE for a while ... 203 is X-Lite and
didn't go UNREACHABLE yet.

206/206          (Unspecified)    D          255.255.255.255  0
Unmonitored
205/205          (Unspecified)    D          255.255.255.255  0
Unmonitored
204/204          209.x.x.125   D   N      255.255.255.255  38340    OK (40
ms)
203/203          209.x.x.125   D   N      255.255.255.255  1548     OK (38
ms)
201/201          192.168.2.112    D          255.255.255.255  5060
Unmonitored
200/200          209.x.x.125   D   N      255.255.255.255  37838
UNREACHABLE


Any ideas?  Is there some trick to get BT100 to cooperate?

Thanks,
Tomas


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